This article is about the scientific and mathematical concept. For the video game, see. For other uses, see.
Number ofhalf-liveselapsedFractionremainingPercentageremaining01⁄ 110011⁄ 25021⁄ 42531⁄ 812.541⁄ 166.2551⁄ 323.12561⁄ 641.56371⁄ 1280.781.n1/ 2 n100/ 2 nHalf-life (symbol t 1⁄2) is the time required for a quantity to reduce to half of its initial value. The term is commonly used in to describe how quickly unstable atoms undergo, or how long stable atoms survive,.
The term is also used more generally to characterize any type of or decay. For example, the medical sciences refer to the of drugs and other chemicals in the human body. The converse of half-life is.The original term, half-life period, dating to 's discovery of the principle in 1907, was shortened to half-life in the early 1950s.
Rutherford applied the principle of a radioactive half-life to studies of age determination of rocks by measuring the decay period of to.Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a for the exponential decay equation. The accompanying table shows the reduction of a quantity as a function of the number of half-lives elapsed. Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right). The number at the top is how many half-lives have elapsed. Note the consequence of the: with more atoms, the overall decay is more regular and more predictable.A half-life usually describes the decay of discrete entities, such as radioactive atoms. In that case, it does not work to use the definition that states 'half-life is the time required for exactly half of the entities to decay'. For example, if there is just one radioactive atom, and its half-life is one second, there will not be 'half of an atom' left after one second.Instead, the half-life is defined in terms of: 'Half-life is the time required for exactly half of the entities to decay '.
In other words, the probability of a radioactive atom decaying within its half-life is 50%.For example, the image on the right is a simulation of many identical atoms undergoing radioactive decay. Note that after one half-life there are not exactly one-half of the atoms remaining, only approximately, because of the random variation in the process.
Nevertheless, when there are many identical atoms decaying (right boxes), the suggests that it is a very good approximation to say that half of the atoms remain after one half-life.There are various simple exercises that demonstrate probabilistic decay, for example involving flipping coins or running a statistical. Formulas for half-life in exponential decay. Further information:There is a half-life describing any exponential-decay process. For example:.
As noted above, in the half-life is the length of time after which there is a 50% chance that an atom will have undergone decay. It varies depending on the atom type and, and is usually determined experimentally. See.
The current flowing through an or decays with a half-life of ln(2) RC or ln(2) L/R, respectively. For this example the term tends to be used, rather than 'half life', but they mean the same thing. In a, the half-life of a species is the time it takes for the concentration of that substance to fall to half of its initial value.
In a first-order reaction the half-life of the reactant is ln(2)/ λ, where λ is the.In non-exponential decay The term 'half-life' is almost exclusively used for decay processes that are exponential (such as radioactive decay or the other examples above), or approximately exponential (such as discussed below). In a decay process that is not even close to exponential, the half-life will change dramatically while the decay is happening. In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its 'first half-life', 'second half-life', etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on. In biology and pharmacology.
See also:A biological half-life or elimination half-life is the time it takes for a substance (drug, radioactive nuclide, or other) to lose one-half of its pharmacologic, physiologic, or radiological activity. John Ayto, 20th Century Words (1989), Cambridge University Press. Chivers, Sidney (March 16, 2003). Retrieved 2012-04-25. Wallin, John (September 1996).
Archived from the original on 2011-09-29. CS1 maint: BOT: original-url status unknown. Jonathan Crowe, Tony Bradshaw (2014).
CS1 maint: Uses authors parameter. Lin VW; Cardenas DD (2003). Demos Medical Publishing, LLC. P. 251. Pang, Xiao-Feng (2014). Water: Molecular Structure and Properties.
New Jersey: World Scientific. P. 451. Australian Pesticides and Veterinary Medicines Authority (31 March 2015).
Australian Government. Retrieved 30 April 2018. This server could not prove that it is its security certificate is from localhost. Fantke, Peter; Gillespie, Brenda W.; Juraske, Ronnie; Jolliet, Olivier (11 July 2014). 'Estimating Half-Lives for Pesticide Dissipation from Plants'.
Environmental Science & Technology. 48 (15): 8588–8602.External links Look up in Wiktionary, the free dictionary.Wikimedia Commons has media related to., Nuclear Science Portal., wiki: Decay Engine., System Dynamics – Time Constants.
Researchers Nikhef and UvA measure slowest radioactive decay ever: Xe-124 with 18 billion trillion years., Half-Life elimination of drugs in blood plasma – Simple Charting Tool.
More on Half Life Long JumpData Added 1: August 14, 2012MetaMod is a plugin/DLL manager that sits between the Half- Life Engine and an HL Game mod, allowing the dynamic loading/unloading of mod-like DLL plugins to add functionality to the HL server or game mod.Size: 309.1 KB License: FreewareData Added 1: April 17, 2012Query Half- Life servers with an online interface to get player info and server rules.Size: 11.7 KB License: FreewareData Added 1: April 11, 2012HLDS Monitor is an automated admin tool for Half Life Dedicated Servers (HLDS). Currently, our focus is based on the modification 'CounterStrike', but will be extended to encompass all modifications in the future.Size: 14.7 KB License: FreewareData Added 1: June 20, 2012hlparse is, as the name would suggest, a Half- Life log parser and interpreter. Half- Life dedicated servers produce data output in a standard format (although they didn't in the past) which is relatively nice to parse.Size: 113.0 KB License: FreewareData Added 1: May 06, 2012A query tool for half life game server admins. Can query Source and GoldSource game servers. Supports split packet and compressed (bzip2) packet handling. Updated to support latest HL1 protocol48 changes.Size: 90.9 KB License: FreewareData Added 1: February 16, 2013Rho-Bot is a computer-generated opponent for the Sierra/Valve game Half- Life. Developed and managed by Jonathan Yaniv.
BSD LicenseSize: 408.7 KB License: FreewareData Added 1: April 10, 2013RChat Half- Life lets Administrators of Half- Life servers chat with clients from a Win32 application. GNU General Public License (GPL)Size: 200.2 KB License: FreewareData Added 1: March 17, 2013A launcher and tool for Half- life and mods to handle multiple players config files. GNU General Public License (GPL)Size: 23.7 KB License: FreewareData Added 1: June 08, 2013MechMod is a total conversion of the Half- Life 1 engine (www.valvesoftware.com) and is based on Mecha or Mechs. Our already-released Alpha 1.0 version of the game lets players control and fight in mechs taken from Gundam and Macross/Robotech series. Open Software License 3.0 (OSL3.0)Size: 2.7 MB License: FreewareData Added 1: May 01, 2013There are lots of bots out for Half- Life. Many closed source or Windows only. All of them are based on Botmans Code ( ).
The goal of this project is to make a self-learning, waypointless, opensource, Linux+Win. Bot GNU General Public License (GPL)Size: 0 License: FreewareData Added 1: June 29, 2013A simple laser tag mod for Half Life 2, made to fulfill the requirements of CS 3500. GNU General Public License (GPL)Size: 0 License: FreewareData Added 1: February 26, 2013Half- Life: Cubed is an attempt to recreate the Half- Life 1 binaries using the Cube Engine. You need a copy of Half- Life 1 to get this program to work as the project still needs files from the official Half- Life game (textures, audio, etc.) zlib/libpng LicenseSize: 0 License: FreewareData Added 1: July 03, 2013The Half- Life server manager is a web-based PHP application which allows server admins to stop/start/configure their Half- Life Dedicated Server or Half- Life TV Server from an easy to use interface. BSD LicenseSize: 0 License: FreewareData Added 1: February 19, 2013Half- Life: ZOMBIE MODE is a modification of Half- Life 1.
Creative Commons Attribution LicenseSize: 0 License: FreewareData Added 1: April 01, 2013My Half- Life Creations. I have using Half- Life 1.1.1.0, Half- Life 1.1.1.1, Source Engine Ep1 and Source Engine 2007. So, some of my creations such as code will not work on old versions of Half- Life and Half- Life 2.
GNU General Public License (GPL); Open Software License 3.0 (OSL3.0)Size: 0 License: FreewareData Added 1: February 17, 2013Spirit of Half- Life 2 is an open-source Mod for Half- Life 2. It will add new features to Valve's Source SDK as requested by the community. Anyone can contribute code to the mod, and anyone can use the mod's source code as a base to create their own Public DomainSize: 0 License: FreewareData Added 1: May 29, 2014MAXIMIZE YOUR GAME! Half- Life is one of the most exciting games of all time. Use these secret codes, and tricks that help you advance quickly.
Get the most out of your play. DON'T JUST PLAY WELL, DOMINATE!!!!Size: 102.4 KB License: Shareware Price: $0.99Data Added 1: May 08, 2013A remake of the Train Hunters mod for Half- Life 1. It is like King of the Hill, but the hill is a train, and it's moving. So you try to stay on as long as possible to get train points while everyone else tries to kill you and get on the train them selve GNU General Public License (GPL)Size: 0 License: FreewareData Added 1: June 21, 2007Periodic table of the elements software. In addition to the usual information found in such programs, it also contains a wealth of nuclear information on each isotope, including half life, decay mode, and daughter products. X-ray data (fluorescence and binding energies) is included, as well as photon interaction values.
Electron shell and particle energies are also listed, along with visible spectra, and a table of wavelengths and amplitudes. There's a handy chart of the nuclides, showing all.Size: 3.4 MB License: Shareware Price: $24.99 Keywords: -Data Added 1: June 21, 2007Periodic table of the elements software.
In addition to the usual information found in such programs, it also contains a wealth of nuclear information on each isotope, including half life, decay mode, and daughter products. X-ray data (fluorescence and binding energies) is included, as well as photon interaction values. Electron shell and particle energies are also listed, along with visible spectra, and a table of wavelengths and amplitudes.
There's a handy chart of the nuclides, showing all.Size: 3.1 MB License: Shareware Price: $24.99 Keywords: -Data Added 1: February 25, 2010FoCoBot is an IRC bot that give administrators access to rcon on Half- Life servers, making it possible to manage them remotely from IRC.Size: 132.0 KB License: FreewareData Added 1: February 25, 2010QSD is a daemon for administering game servers (like Quake, Half Life, etc). It uses a flexible plugin architecture for both authentication and for interfacing with the individual game servers.
Long Jump Half Life Xen
QSD: Game Server Daemon.Size: 212.0 KB License: FreewareData Added 1: June 28, 2014Fly to the Moon is a tetris-like game. Help a caterpillar, Joe to earn the money he needs to build a rocket. Thanks to you, Joe will be able to build a rocket and fulfill his life- long dream to visit the Moon.
There are several bonuses in the game, and many levels to hold your interest. Fly to the Moon is a tetris-like game. Help a caterpillar, Joe to earn the money he needs to build a rocket. Thanks to you, Joe will be able to build a rocket and fulfill his life- long dream to.Size: 16.2 MB License: Freeware Keywords: - -Data Added 1: September 07, 2012Marine Bot provides computer generated players (bots) for the Half- Life mod Firearms, for both online and offline play.
Marine Bot is designed for Firearms 2.9-3.0, and is also backwards compatible with all Firearms versions back to 2.4.Size: 1.6 MB License: FreewareData Added 1: September 01, 2012AMX Mod X is a Metamod plugin which allows you to write modifications for Half- Life with Small scripting language. It provides in-game administration tools, game statistics, server management and gameplay modificators. It is based on the original AMX ModSize: 288.6 KB License: FreewareData Added 1: September 24, 2012phpAdminMod is geared towards those Half- life server operators who want to be able to maintain a secure Admin Mod through a web page. Currently Admin Mod supports intergration with HLStats, and runs on both Linux/Unix and Windows platforms. Supports instaSize: 10.1 KB License: FreewareData Added 1: May 15, 2012Chrono-Stats is a Half- Life:Counter-Strike log parser.
What makes it unique from any other, is the built in web panel.
Bought HL1 off of steam a few weeks ago. Sweet nostalgiaI'm up to Xen, after the teleport. You are meant to use the 'long jump' module to go from platform to platform. But for some reason, I can't actually long jump.I've tried it as moving then quickly crouching then hitting jump = no go.I've also tried hitting jump and crouch at the same time = no go either.Is there something im missing on how to do it? I dont want to have to cheat and put on noclipping just to get from one platform to the other. Bought HL1 off of steam a few weeks ago. Sweet nostalgiaI'm up to Xen, after the teleport.
Long Jump In Half Life
You are meant to use the 'long jump' module to go from platform to platform. But for some reason, I can't actually long jump.I've tried it as moving then quickly crouching then hitting jump = no go.I've also tried hitting jump and crouch at the same time = no go either.Is there something im missing on how to do it? I dont want to have to cheat and put on noclipping just to get from one platform to the other.
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